package com.ljj.admin.common.utils;

import cn.hutool.core.convert.Convert;
import cn.hutool.core.util.StrUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * 客户端工具类
 */
@Slf4j
public class ServletUtils {

    //持有上下文的request 容器
    private static ServletRequestAttributes getRequestAttributes(){
        RequestAttributes attributes = RequestContextHolder.getRequestAttributes();
        return (ServletRequestAttributes) attributes;
    }

    /**
     * 获取request 对象
     * @return
     */
   public static HttpServletRequest getRequest()
   {
       return getRequestAttributes().getRequest();
   }

    /**
     * 获取repost 对象
     * @return
     */
   public static HttpServletResponse getRepost()
   {
       return getRequestAttributes().getResponse();
   }

    /**
     * 获取当前对话 session
     * @return
     */
   public static HttpSession getSession()
   {
       return getRequest().getSession();
   }

    /**
     * 获取 String 参数
     * @param name
     * @return
     */
   public static String getParameter(String name)
   {
       return getRequest().getParameter("name");
   }

    /**
     * 获取String参数 带默认值
     */
    public static String getParameter(String name, String defaultValue) {
        return Convert.toStr(getRequest().getParameter(name), defaultValue);
    }

    /**
     * 获取Integer参数
     */
    public static Integer getParameterToInt(String name) {
        return Convert.toInt(getRequest().getParameter(name));
    }

    /**
     * 获取Integer参数
     */
    public static Integer getParameterToInt(String name, Integer defaultValue) {
        return Convert.toInt(getRequest().getParameter(name), defaultValue);
    }

    /**
     * 将字符串渲染到客户端
     *
     * @param response 渲染对象
     * @param string   待渲染的字符串
     * @return null
     */
    public static String renderString(HttpServletResponse response, String string) {
        try {
            response.setContentType("application/json");
            response.setCharacterEncoding("utf-8");
            response.getWriter().print(string);
        } catch (IOException e) {
            log.error(e.getMessage(),e);
        }
        return null;
    }

    /**
     * 是否是Ajax异步请求
     *
     * @param request
     */
    public static boolean isAjaxRequest(HttpServletRequest request) {

        String accept = request.getHeader("accept");
        if (accept != null && accept.contains("application/json")) {
            return true;
        }

        String xRequestedWith = request.getHeader("X-Requested-With");
        if (xRequestedWith != null && xRequestedWith.contains("XMLHttpRequest")) {
            return true;
        }

        String uri = request.getRequestURI();
        if (StrUtil.containsAnyIgnoreCase(uri, ".json" , ".xml")) {
            return true;
        }

        String ajax = request.getParameter("__ajax");
        return StrUtil.containsAnyIgnoreCase(ajax, "json", "xml");

    }





}
